package com.tanhua.server.interceptor;

import com.alibaba.fastjson.JSON;
import com.tanhua.commons.exception.TanHuaException;
import com.tanhua.model.db.User;
import com.tanhua.model.vo.ErrorResult;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Component
public class TokenInterceptor implements HandlerInterceptor {

    @Autowired
    private StringRedisTemplate redisTemplate;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String token = request.getHeader("Authorization");
        String key = "TOKEN_" + token;
        String redisUser = redisTemplate.opsForValue().get(key);
        if(StringUtils.isEmpty(redisUser)) {
            throw new TanHuaException(ErrorResult.timeoutCodeError());
        }

        User user = JSON.parseObject(redisUser, User.class);
        UserHolder.setUser(user);
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        UserHolder.remove();
    }
}
